﻿/*  Arg_parser - A POSIX/GNU command line argument parser. (C version)
Copyright (C) 2006, 2007, 2008, 2009, 2010 Antonio Diaz Diaz.

This library is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this library.  If not, see <http://www.gnu.org/licenses/>.

As a special exception, you may use this file as part of a free
software library without restriction.  Specifically, if other files
instantiate templates or use macros or inline functions from this
file, or you compile this file and link it with other files to
produce an executable, this file does not by itself cause the
resulting executable to be covered by the GNU General Public
License.  This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU General
Public License.
*/

#include <stdlib.h>
#include <string.h>

#include "carg_parser.h"


/* assure at least a minimum size for buffer `buf' */
static void * ap_resize_buffer( void * buf, const int min_size )
{
    if( buf ) buf = realloc( buf, min_size );
    else buf = malloc( min_size );
    return buf;
}


static char push_back_record( struct Arg_parser * const ap,
    const int code, const _TCHAR * const argument )
{
    const int len = _tcslen( argument );
    struct ap_Record *p;
    void * tmp = ap_resize_buffer( ap->data, ( ap->data_size + 1 ) * sizeof (struct ap_Record) );
    if( !tmp ) return 0;
    ap->data = (struct ap_Record *)tmp;
    p = &(ap->data[ap->data_size]);
    p->code = code;
    p->argument = 0;
    tmp = ap_resize_buffer( p->argument, sizeof(_TCHAR) * (len + 1) );
    if( !tmp ) return 0;
    p->argument = (_TCHAR *)tmp;
    _tcsncpy( p->argument, argument, len + 1 );
    ++ap->data_size;
    return 1;
}


static char add_error( struct Arg_parser * const ap, const _TCHAR * const msg )
{
    const int len = _tcslen( msg );
    void * tmp = ap_resize_buffer( ap->error, sizeof(_TCHAR) * (ap->error_size + len + 1) );
    if( !tmp ) return 0;
    ap->error = (_TCHAR *)tmp;
    _tcsncpy( ap->error + ap->error_size, msg, len + 1 );
    ap->error_size += len;
    return 1;
}


static void free_data( struct Arg_parser * const ap )
{
    int i;
    for( i = 0; i < ap->data_size; ++i ) free( ap->data[i].argument );
    if( ap->data ) { free( ap->data ); ap->data = 0; }
    ap->data_size = 0;
}


static char parse_long_option( struct Arg_parser * const ap,
    const _TCHAR * const opt, const _TCHAR * const arg,
    const struct ap_Option options[],
    int * const argindp )
{
    unsigned int len;
    int index = -1;
    int i;
    char exact = 0, ambig = 0;

    for( len = 0; opt[len+2] && opt[len+2] != '='; ++len ) ;

    // Test all long options for either exact match or abbreviated matches.
    for( i = 0; options[i].code != 0; ++i )
        if( options[i].name && !_tcsncmp( options[i].name, &opt[2], len ) )
        {
            if( _tcslen( options[i].name ) == len )    // Exact match found
            { index = i; exact = 1; break; }
            else if( index < 0 ) index = i;        // First nonexact match found
            else if( options[index].code != options[i].code ||
                options[index].has_arg != options[i].has_arg )
                ambig = 1;            // Second or later nonexact match found
        }

        if( ambig && !exact )
        {
            add_error( ap, _T("选项 “") ); add_error( ap, opt );
            add_error( ap, _T("” 有歧义") );
            return 1;
        }

        if( index < 0 )        // nothing found
        {
            add_error( ap, _T("无法识别选项 “") ); add_error( ap, opt );
            add_error( ap, _T("”") );
            return 1;
        }

        ++*argindp;

        if( opt[len+2] )        // `--<long_option>=<argument>' syntax
        {
            if( options[index].has_arg == ap_no )
            {
                add_error( ap, _T("选项 “--") ); add_error( ap, options[index].name );
                add_error( ap, _T("” 不允许存在参数") );
                return 1;
            }
            if( options[index].has_arg == ap_yes && !opt[len+3] )
            {
                add_error( ap, _T("选项 “--") ); add_error( ap, options[index].name );
                add_error( ap, _T("” 需要参数") );
                return 1;
            }
            return push_back_record( ap, options[index].code, &opt[len+3] );
        }

        if( options[index].has_arg == ap_yes )
        {
            if( !arg || !arg[0] )
            {
                add_error( ap, _T("选项 “--") ); add_error( ap, options[index].name );
                add_error( ap, _T("” 需要参数") );
                return 1;
            }
            ++*argindp;
            return push_back_record( ap, options[index].code, arg );
        }

        return push_back_record( ap, options[index].code, _T("") );
}


static char parse_short_option( struct Arg_parser * const ap,
    const _TCHAR * const opt, const _TCHAR * const arg,
    const struct ap_Option options[],
    int * const argindp )
{
    int cind = 1;            // character index in opt

    while( cind > 0 )
    {
        int index = -1;
        int i;
        const _TCHAR code = opt[cind];
        const _TCHAR code_str[2] = { code, 0 };

        if( code != 0 )
            for( i = 0; options[i].code; ++i )
                if( code == options[i].code )
                { index = i; break; }

                if( index < 0 )
                {
                    add_error( ap, _T("选项 “-") ); add_error( ap, code_str );
                    add_error( ap, _T("” 无效") );
                    return 1;
                }

                if( opt[++cind] == 0 ) { ++*argindp; cind = 0; }    // opt finished

                if( options[index].has_arg != ap_no && cind > 0 && opt[cind] )
                {
                    if( !push_back_record( ap, code, &opt[cind] ) ) return 0;
                    ++*argindp; cind = 0;
                }
                else if( options[index].has_arg == ap_yes )
                {
                    if( !arg || !arg[0] )
                    {
                        add_error( ap, _T("选项 “-") );
                        add_error( ap, code_str );
                        add_error( ap, _T("” 需要参数") );
                        return 1;
                    }
                    ++*argindp; cind = 0;
                    if( !push_back_record( ap, code, arg ) ) return 0;
                }
                else if( !push_back_record( ap, code, _T("") ) ) return 0;
    }
    return 1;
}


char ap_init( struct Arg_parser * const ap,
    const int argc, const _TCHAR * const argv[],
    const struct ap_Option options[], const char in_order )
{
    const _TCHAR ** non_options = 0;    // skipped non-options
    int non_options_size = 0;        // number of skipped non-options
    int argind = 1;            // index in argv
    int i;

    ap->data = 0;
    ap->error = 0;
    ap->data_size = 0;
    ap->error_size = 0;
    if( argc < 2 || !argv || !options ) return 1;

    while( argind < argc )
    {
        const _TCHAR ch1 = argv[argind][0];
        const _TCHAR ch2 = ( ch1 ? argv[argind][1] : 0 );

        if( ch1 == '-' && ch2 )        // we found an option
        {
            const _TCHAR * const opt = argv[argind];
            const _TCHAR * const arg = (argind + 1 < argc) ? argv[argind+1] : 0;
            if( ch2 == '-' )
            {
                if( !argv[argind][2] ) { ++argind; break; }    // we found "--"
                else if( !parse_long_option( ap, opt, arg, options, &argind ) ) return 0;
            }
            else if( !parse_short_option( ap, opt, arg, options, &argind ) ) return 0;
            if( ap->error ) break;
        }
        else
        {
            if( !in_order )
            {
                void * tmp = ap_resize_buffer( (void *)non_options,
                    ( non_options_size + 1 ) * sizeof *non_options );
                if( !tmp ) return 0;
                non_options = (const TCHAR **)tmp;
                non_options[non_options_size++] = argv[argind++];
            }
            else if( !push_back_record( ap, 0, argv[argind++] ) ) return 0;
        }
    }
    if( ap->error ) free_data( ap );
    else
    {
        for( i = 0; i < non_options_size; ++i )
            if( !push_back_record( ap, 0, non_options[i] ) ) return 0;
        while( argind < argc )
            if( !push_back_record( ap, 0, argv[argind++] ) ) return 0;
    }
    if( non_options ) free( (void *)non_options );
    return 1;
}


void ap_free( struct Arg_parser * const ap )
{
    free_data( ap );
    if( ap->error ) { free( ap->error ); ap->error = 0; }
    ap->error_size = 0;
}


const _TCHAR * ap_error( const struct Arg_parser * const ap )
{ return ap->error; }


int ap_arguments( const struct Arg_parser * const ap )
{ return ap->data_size; }


int ap_code( const struct Arg_parser * const ap, const int i )
{
    if( i >= 0 && i < ap_arguments( ap ) ) return ap->data[i].code;
    else return 0;
}


const _TCHAR * ap_argument( const struct Arg_parser * const ap, const int i )
{
    if( i >= 0 && i < ap_arguments( ap ) ) return ap->data[i].argument;
    else return _T("");
}
